We know for surethat 10,500 years ago, the water level in the Lake Michiganbasin dropped...
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We know for sure
that 10,500 years ago, the water level in the Lake Michigan
basin dropped precipitously and drained to a much lower level
for at least 3,500 years
that 10,500 years ago, the water level in the Lake Michigan
basin dropped precipitously and drained to a much lower level
for at least 3,500 years
Full Transcript
00:00:01.000 --> 00:00:04.068
We know for sure
that 10,500 years ago,
00:00:04.076 --> 00:00:08.056
the water level in the Lake Michigan
basin dropped precipitously
00:00:08.064 --> 00:00:13.056
and drained to a much lower level
for at least 3,500 years.
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Using cutting-edge technologies such as ground penetrating radar (GPR), LIDAR (Light Detection and Ranging), and 3-D imaging, scientists research fascinating underworlds of secret tunnel networks, ancient structures, and bizarre g...
